Boredom should NEVER be an symptom in your life. All you need to do is read this list and Rock-N-Roll!
WARNING: Some of these may result in people chasing you. Always wear tennis shows and have your escape route planned out :)

1: Reply to everything someone says with, "that's what YOU think!"

2: Buy a large quantity of orange traffic cones and re-route entire streets.
(This one is especially useful if you're having a yard sale!)

3: Ask people what gender they are. When they reply, ask - "are you sure?"
(Not recommended at Biker Bars)

4: Signal that a conversation is over by clamping your hands over your ears and repeatedly saying "blah, blah, blah, blah".

5: Sit in your front yard pointing a hair dryer at passing cars to see if they slow down.
(Works even better if your rent a cop uniform.)

6: Go to your local mall. Walk up to strangers and say: "Do you hear that?" "What?" "Never mind, it's gone now." If they answer you, go to plan 4 above. Be prepared to run real fast :)

7: Go to the local electronics or appliance store. Adjust the tint on all their TV's so that all the people are green. When an employees asks what you're doing, insist that you "like it that way."

8: Drive around your city or town honking at pedestians. Flip them off while driving by. Collect points for reactions:

A: They flip you off - plus 20 points.
B: They wave at you - minus 10 points.
C: No reaction or blank stare - minus 10 points.
D: They trip or run into something while staring - plus 25 points.
Bonus: If they fall down, give yourself 100 points.